Node. js simulated Browser file upload example

This article mainly introduces the implementation code of Node. js simulating Browser file upload. If you need it, you can refer to OSChina and send it to me. Now, put it here, haha.

This code can only upload one file at a time ~~

Var path = require ("path"); var fs = require ("fs"); var http = require ("http "); // post value payload var getfield = function (field, value) {return 'content-Disposition: form-data; name = "'+ field +'" \ r \ n \ r \ n' + value + '\ r \ n';} // file payload var getfieldHead = function (field, filename) {var fileFieldHead = 'content-Disposition: form-data; name = "'+ field + '"; filename = "'+ filename +'" \ r \ n' + 'content-Type: '+ getMime (filename) +' \ R \ n \ r \ n'; return fileFieldHead;} // obtain the Mime var getMime = function (filename) {var mimes = {'.png ': 'image/png ', '.gif ': 'image/gif', '.jpg ': 'image/jpeg', '.jpeg ': 'image/jpeg ','. js': 'appliction/json ','. torrent ': 'application/octet-stream'}; var ext = path. extname (filename); var mime = mimes [ext]; mime = !! Mime? Mime: 'application/octet-stream'; return mime;} // obtain the boundary check random string var getBoundary = function () {var max = 9007199254740992; var dec = Math. random () * max; var hex = dec. toString (36); var boundary = hex; return boundary;} // get boundary var getBoundaryBorder = function (boundary) {return '--' + boundary + '\ r \ n';} // format the function fieldPayload (opts) {var payload = []; for (var id in opts. field) {payload. push (getfield (id, opts. field [id]);} payload. push (""); return payload. join (getBoundaryBorder (opts. boundary);} // post data function postRequest (opts) {filereadstream (opts, function (buffer) {var options = require ('url '). parse (opts. url); var Header ={}; var h = getBoundaryBorder (opts. boundary); var e = fieldPayload (opts); var a = getfieldHead (opts. param, opts. file); var d = "\ r \ n" + h; Header ["Content-Length"] = Buffer. byteLength (h + e + a + d) + buffer. length; Header ["Content-Type"] = 'multipart/form-data; boundary = '+ opts. boundary; options. headers = Header; options. method = 'post'; var req = http. request (options, function (res) {var data = ''; res. on ('data', function (chunk) {data + = chunk;}); res. on ('end', function () {console. log (res. statusCode) console. log (data) ;}); req. write (h + e + a); log. diy (h + e + a + buffer + d); req. write (buffer); req. end (d) ;}) ;}// read the file function filereadstream (opts, fn) {var readstream = fs. createReadStream (opts. file, {flags: 'R', encoding: null}); var chunks = []; var length = 0; readstream. on ('data', function (chunk) {length + = chunk. length; chunks. push (chunk) ;}); readstream. on ('end', function () {var buffer = new Buffer (length); for (var I = 0, pos = 0, size = chunks. length; I <size; I ++) {chunks [I]. copy (buffer, pos); pos + = chunks [I]. length ;}fn (buffer) ;}) ;}// various settings var opt = {"url ":" http://xxxx.xx ", // Url" file ":" 00.jpg", // file location "param": "file", // file upload field name "field ": {// other post fields "client": "1", "title": "OK"}, "boundary": "---- WebKitFormBoundary" + getBoundary ()} postRequest (opt);/* ------ WebKitFormBoundaryuzKmkAovUuYsQ1Dt \ r \ n Content-Disposition: form-data; name = "file"; filename = "00.jpg" \ r \ n Content-Type: application/octet-stream \ r \ n + file \ r \ n ------ WebKitFormBoundaryuzKmkAovUuYsQ1Dt \ r \ n Content-Disposition: form-data; name = "fieldName" \ r \ n + value \ r \ n ------ WebKitFormBoundaryuzKmkAovUuYsQ1Dt --*/

Finally, the standard format "\ r \ n" is used to indicate the actual string. To look comfortable, adjust it visually.

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